questions stringlengths 37 1.22k | reasoning stringlengths 0 3.56k ⌀ | answers stringlengths 4 138 |
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But a point mutation can also change a codon for an amino acid into a what?
Here are the choices:
A. exon
B. stop codon
C. axon
D. stop mutation | B: stop codon. | |
The location of an object in a frame of reference is called what?
Here are the choices:
A. fact
B. position
C. change
D. marker | The location of an object in a frame of reference is called position. | B: position. |
What kind of change causes evolution in population?
Here are the choices:
A. morphogenesis frequency changes
B. transgenic frequency changes
C. paragenic frequency changes
D. allele frequency changes | Evolution occurs in a population when allele frequencies change over time. What causes allele frequencies to change? That question was answered by Godfrey Hardy and Wilhelm Weinberg in 1908. | D: allele frequency changes. |
What type of lipids contain the element phosphorus, carbon, hydrogen and oxygen?
Here are the choices:
A. eukaryotes
B. alleles
C. filaments
D. phospholipids | Some lipids contain the element phosphorus as well as carbon, hydrogen, and oxygen. These lipids are called phospholipids. Two layers of phospholipid molecules make up the cell membranes of living things. In the Figure below , you can see how phospholipid molecules are arranged in a cell membrane. | D: phospholipids. |
Photosynthesis requires light, water and what else?
Here are the choices:
A. seasons
B. carbon dioxide
C. nitrogen
D. soil | Plants are somewhat limited by temperature in terms of where they can grow. They need temperatures above freezing while they are actively growing. They also need light, carbon dioxide, and water. These substances are required for photosynthesis. Like most other living things, plants need oxygen. Oxygen is required for ... | B: carbon dioxide. |
Tropical rainforest, temperate grassland, and tundra are examples of what type of biomes?
Here are the choices:
A. terrestrial
B. oceanic
C. horizontal
D. atmospheric | Terrestrial biomes include tropical rainforest, temperate grassland, and tundra. | A: terrestrial. |
What is described by the concentration of hydrogen ions in a solution?
Here are the choices:
A. neutrality
B. oxidation
C. ph
D. hydrogeny | Acidity is measured by pH, which is the concentration of hydrogen ions in a solution. | C: ph. |
Which theory states that all organisms are composed of one or more cells, the cell is the basic unit of life, and new cells arise from existing cells?
Here are the choices:
A. microcellular theory
B. unified cell theory
C. natural selection
D. theory of evolution | CHAPTER SUMMARY 3.1 How Cells Are Studied A cell is the smallest unit of life. Most cells are so small that they cannot be viewed with the naked eye. Therefore, scientists must use microscopes to study cells. Electron microscopes provide higher magnification, higher resolution, and more detail than light microscopes. T... | B: unified cell theory. |
Light retains its original color under water because what remains the same when light is refracted?
Here are the choices:
A. sound
B. wave length
C. frequency
D. density | When light is refracted its wavelength and speed change; however, its frequency remains the same as the frequency of the light source. Proof of this is that light retains its original color under water. For example, blue light is still blue under water. | C: frequency. |
What are interferons?
Here are the choices:
A. cytokines
B. pathogens
C. oncogenes
D. T cells | Figure 42.4 Interferons are cytokines that are released by a cell infected with a virus. Response of neighboring cells to interferon helps stem the infection. | A: cytokines. |
What is the air that remains after a forced exhalation called?
Here are the choices:
A. residual volume
B. kinetic volume
C. remaining volume
D. abundant volume | A: residual volume. | |
What is the term for a gas that completely abides by the kinetic-molecular theory?
Here are the choices:
A. fast gas
B. ideal gas
C. heat gas
D. cold gas | An ideal gas is one that follows the gas laws at all conditions of temperature and pressure. To do so, the gas would need to completely abide by the kinetic-molecular theory. The gas particles would need to occupy zero volume and they would need to exhibit no attractive forces what so ever toward each other. Since neit... | B: ideal gas. |
What is required to partially overcome the attractive forces between molecules in a solid to form a liquid?
Here are the choices:
A. fuel
B. hydrogen
C. energy
D. oxygen | Figure 14.7 (a) Energy is required to partially overcome the attractive forces between molecules in a solid to form a liquid. That same energy must be removed for freezing to take place. (b) Molecules are separated by large distances when going from liquid to vapor, requiring significant energy to overcome molecular at... | C: energy. |
Cephalochordates have a notochord and nerve cord but not a?
Here are the choices:
A. brain
B. backbone
C. digestive system
D. nervous system | Cephalochordata: Cephalochordates include the lancelets ( Figure below ), fish-like marine animals often found half-buried in the sand. Cephalochordates have a notochord and nerve cord but no backbone. | B: backbone. |
Name the physicist who discovered radioactivity?
Here are the choices:
A. neal degrasse tyson
B. antoine henri becquerel
C. louis pasteur
D. albert einstein | Radioactivity was discovered in 1896 by a French physicist named Antoine Henri Becquerel. Becquerel was experimenting with uranium, which glows after being exposed to sunlight. Becquerel wanted to see if the glow was caused by rays of energy, like rays of light and X-rays. He placed a bit of uranium on a photographic p... | B: antoine henri becquerel. |
Researchers have identified the receptor proteins for all of the tastes except which?
Here are the choices:
A. bitter
B. sweet
C. salty
D. acid | C: salty. | |
What has high surface tension because of extensive hydrogen bonding?
Here are the choices:
A. air
B. gases
C. water
D. hydrocarbons | Water has high surface tension because of extensive hydrogen bonding. | C: water. |
Where are sponges most likely anchored to?
Here are the choices:
A. sea floor
B. beaches
C. reef or rock
D. sand | Sponges are a source of food for many species of fish. Because sponges are anchored to a reef or rock, they can’t run away from predators. However, their sharp spicules provide some defense. They also produce toxins that may poison predators that try to eat them. | C: reef or rock. |
What do jellyfish use to startle predators?
Here are the choices:
A. harsh light
B. black light
C. bicellular light
D. visible light | Bioluminescent organisms include jellyfish and fireflies. Jellyfish give off visible light to startle predators. Fireflies give off visible light to attract mates. | D: visible light. |
What do corals secrete that builds up to become a coral reef?
Here are the choices:
A. scales
B. mucous
C. membrane
D. exoskeleton | Cnidarians include jellyfish and corals. They are aquatic invertebrates. They have tissues and radial symmetry. They also have tentacles with stingers. There are two cnidarian body plans: the polyp and the medusa. They differ in several ways. Many corals secrete an exoskeleton that builds up to become a coral reef. | D: exoskeleton. |
What layer covers the bones that make them look tough, shiny, and white?
Here are the choices:
A. epidermis
B. cuticle
C. epithelium
D. periosteum | Bones look tough, shiny, and white because they are covered by a layer called the periosteum . Many bones also contain a soft connective tissue called bone marrow in the pores of the spongy bone. Bone marrow is where blood cells are made. | D: periosteum. |
John dalton thought that what unit, which means "indivisible", could not be divided into smaller, simpler particles?
Here are the choices:
A. atom
B. electron
C. neutron
D. nucleus | Scientists have long wanted to find the most basic building blocks of the universe. They asked, “what are the fundamental particles of matter that cannot be subdivided into smaller, simpler particles,” and “what holds these particles together?” The quest for fundamental particles began thousands of years ago. Scientist... | A: atom. |
What gems are created by mollusks, such as oysters?
Here are the choices:
A. crystals
B. diamonds
C. turquoise
D. pearls | Pearls are highly valued as gemstones. Most gemstones come from the Earth, but pearls come from living things. They are created by mollusks, such as oysters. | D: pearls. |
Extrusive igneous rocks are also called what?
Here are the choices:
A. metamorphic
B. agates
C. magma minerals
D. volcanic rocks | Extrusive igneous rocks form above the surface. The lava cools quickly as it pours out onto the surface ( Figure below ). Extrusive igneous rocks cool much more rapidly than intrusive rocks. The rapid cooling time does not allow time for large crystals to form. So igneous extrusive rocks have smaller crystals than igne... | D: volcanic rocks. |
What happened to chemical reactions when temperature increases?
Here are the choices:
A. it stays the same
B. it became faster
C. it becomes slower
D. it slows down for a short time then speeds up | Temperature increases. Chemical reactions are faster at higher temperatures. | B: it became faster. |
Where do living things obtain the energy to carry out all life processes?
Here are the choices:
A. fuel
B. food
C. waste
D. oxygen | Living things need energy to carry out all life processes. They get energy from food. | B: food. |
What is another term for all eukaryotic organisms that are neither animals, nor plants, nor fungi?
Here are the choices:
A. arthropods
B. protists
C. paramecium
D. prokaryotes | Protists are eukaryotes , which means their cells have a nucleus and other membrane-bound organelles. Most, but not all, protists are single-celled. Other than these features, they have very little in common. You can think about protists as all eukaryotic organisms that are neither animals, nor plants, nor fungi. | B: protists. |
Tissues of marine bony fishes gain what from their surroundings?
Here are the choices:
A. absorb salts
B. excess salts
C. mercury
D. toxins | B: excess salts. | |
When magma reaches the surface through cracks in the earth's crust, what occurs?
Here are the choices:
A. volcanic eruption
B. tsunami
C. volcanic explosion
D. magma eruption | All volcanoes share the same basic features. First, mantle rock melts. The molten rock collects in magma chambers that can be 160 kilometers (100 miles) beneath the surface. As the rock heats, it expands. The hot rock is less dense than the surrounding rock. The magma rises toward the surface through cracks in the crus... | A: volcanic eruption. |
The peripheral nervous system consists of all the nerves that are found outside what?
Here are the choices:
A. somatic nervous system
B. central nervous system
C. autonomic nerous system
D. large nervous system | The peripheral nervous system consists of all the nerves that are found outside the central nervous system. | B: central nervous system. |
Where is gabbro found?
Here are the choices:
A. oceanic crust
B. volcanoes
C. forest floor
D. wetlands | Gabbro is a dark dense rock that can be found in oceanic crust. | A: oceanic crust. |
Mypyramid features colored bands that represent what?
Here are the choices:
A. essential vitamins
B. caloric content
C. popular diets
D. food groups | MyPyramid can help you choose foods wisely for good health. Each colored band represents a different food group. The key shows which food group each color represents. Which colored band of MyPyramid is widest? Which food group does it represent?. | D: food groups. |
Which type of diseases do antibiotics treat?
Here are the choices:
A. viral diseases
B. genetic disorders
C. nervous diseases
D. bacterial diseases | Fungi can produce antibiotics , such as penicillin. Antibiotics are important medicines that kill bacteria, and penicillin was the first identified cure against many deadly bacterial species. Antibiotics only treat bacterial diseases; they can not be used to treat viral or fungal diseases. | D: bacterial diseases. |
What is the loss of energy available to do work called?
Here are the choices:
A. negentropy
B. power
C. force
D. entropy | 15.6 Entropy and the Second Law of Thermodynamics: Disorder and the Unavailability of Energy • Entropy is the loss of energy available to do work. • Another form of the second law of thermodynamics states that the total entropy of a system either increases or remains constant; it never decreases. • Entropy is zero in a... | D: entropy. |
What do you call the gently sloped ocean floor nearest the edges of continents?
Here are the choices:
A. continental shelf
B. continental solution
C. continental stratosphere
D. continental divide | The continental shelf is the ocean floor nearest the edges of continents. It has a a gentle slope. The water over the continental shelf is shallow. | A: continental shelf. |
What uses oxygen gas to break apart the carbon-hydrogen bonds in glucose and release their energy?
Here are the choices:
A. energetic respiration
B. electromagnetic respiration
C. cellular respiration
D. classical respiration | In words, cellular respiration uses oxygen gas to break apart the carbon-hydrogen bonds in glucose and release their energy to build 38 molecules of ATP. Most of this process occurs within the mitochondria of the cell. Carbon dioxide and water are waste products. This is similar to burning, in which oxygen breaks the c... | C: cellular respiration. |
Which human body system system moves nutrients and other substances throughout the body?
Here are the choices:
A. cardiovascular system
B. Muscular system
C. Integumentary system
D. Digestive system | The cardiovascular system moves nutrients and other substances throughout the body. | A: cardiovascular system. |
An elastic collision is one that conserves internal energy of what type?
Here are the choices:
A. kinetic
B. thermal
C. seismic
D. potential | 8.4 Elastic Collisions in One Dimension Let us consider various types of two-object collisions. These collisions are the easiest to analyze, and they illustrate many of the physical principles involved in collisions. The conservation of momentum principle is very useful here, and it can be used whenever the net externa... | A: kinetic. |
What term refers to an animal that sleeps during the day and is active at night?
Here are the choices:
A. crepuscular
B. nocturnal
C. diurnal
D. solitary | Many animals go through daily cycles. Daily cycles of behavior are called circadian rhythms. For example, most animals go to sleep when the sun sets down and wake up when the sun rises. These animals are active during the day and called diurnal. Other animals go to sleep when the sun rises and wake up when the sun sets... | B: nocturnal. |
What do you call a period when temperatures are cooler than normal, causing glaciers to spread?
Here are the choices:
A. earth age
B. ice age
C. thermal age
D. polar age | Over much of Earth’s past, the climate was warmer than it is today. Picture in your mind dinosaurs roaming the land. They're probably doing it in a pretty warm climate! But ice ages also occurred many times in the past. An ice age is a period when temperatures are cooler than normal. This causes glaciers to spread to l... | B: ice age. |
Every object is attracted to every other object by what force?
Here are the choices:
A. weight
B. gravity
C. pheromones
D. magnetism | Every object is attracted to every other object by gravity. The force of gravity between two objects depends on the mass of the objects. It also depends on how far apart the objects are. When you are sitting next to your dog, there is a gravitational force between the two of you. That force is far too weak for you to n... | B: gravity. |
What begins when an oogonium with the diploid number of chromosomes undergoes mitosis?
Here are the choices:
A. germination
B. morphogenesis
C. gametogenesis
D. oogenesis | Oogenesis begins long before birth when an oogonium with the diploid number of chromosomes undergoes mitosis. It produces a diploid daughter cell called a primary oocyte. The primary oocyte, in turn, starts to go through the first cell division of meiosis (meiosis I). However, it does not complete meiosis until much la... | D: oogenesis. |
What is the most abundant element in the universe?
Here are the choices:
A. nitrogen
B. carbon
C. helium
D. hydrogen | Isotopes of Hydrogen Hydrogen, the most abundant element in the universe, is the ultimate source of all other elements by the process of nuclear fusion. (For more information on nuclear fusion, seeChapter 20 "Nuclear Chemistry". ) Table 21.2 "The Isotopes of Hydrogen" compares the three isotopes of hydrogen, all of whi... | D: hydrogen. |
If the electromagnetic repulsion between protons is greater than the strong nuclear force of attraction between them, what do they become?
Here are the choices:
A. unstable , or experimental
B. unstable, or radioactive
C. slow , or radioactive
D. destroyed | The strong nuclear force works only over very short distances. As a result, it isn’t effective if the nucleus gets too big. As more protons are added to the nucleus, the electromagnetic force of repulsion between them gets stronger, while the strong nuclear force of attraction between them gets weaker. This puts an upp... | B: unstable, or radioactive. |
What disease, caused by vitamin c deficiency, causes bleeding gums, nosebleeds, and other symptoms?
Here are the choices:
A. leukemia
B. dehydration
C. scurvy
D. rickets | Not getting enough vitamins can cause health problems. For example, too little vitamin C causes a disease called scurvy. People with scurvy have bleeding gums, nosebleeds, and other symptoms. | C: scurvy. |
What type of waves are the slowest of all seismic waves?
Here are the choices:
A. central waves
B. core waves
C. thick waves
D. surface waves | Surface waves travel along the ground outward from an earthquake’s epicenter. Surface waves are the slowest of all seismic waves. They travel at 2.5 km (1.5 miles) per second. There are two types of surface waves. Love waves move side-to-side, much like a snake. Rayleigh waves produce a rolling motion as they move up a... | D: surface waves. |
What are the two types of optical telescopes?
Here are the choices:
A. reflecting and layering
B. refracting and compound
C. reflecting and refracting
D. reflecting and recapitulating | Optical telescopes are designed to collect visible light. The two types of optical telescopes are reflecting telescopes and refracting telescopes. | C: reflecting and refracting. |
What can be hard or even impossible to perform in a scientific sense?
Here are the choices:
A. experiments
B. theorys
C. hypothesises
D. idea | Experiments are sometimes hard or even impossible to do. For example, a scientist who is studying an extinct animal cannot experiment with the animal because it no longer exists. The scientist must rely instead on evidence in the natural world, such as fossils that the extinct animal left behind. | A: experiments. |
In contrast to mammals and birds, freshwater fishes produce large volumes of very dilute what?
Here are the choices:
A. feces
B. nitrogen
C. urine
D. blood | C: urine. | |
What is the matter through which sound waves travel?
Here are the choices:
A. air
B. medium
C. mass
D. dust | Sound waves are mechanical waves, and mechanical waves can only travel through matter. The matter through which the waves travel is called the medium (plural, media). The Table below gives the speed of sound in several different media. Generally, sound waves travel most quickly through solids, followed by liquids, and ... | B: medium. |
Polygenic traits result in a distribution that resembles a curve. what is the shape of the curve?
Here are the choices:
A. J-shaped
B. W-shaped
C. egg-shaped
D. bell-shaped | David Remahl. Polygenic traits result in a distribution that resembles a bell-shaped curve . The creator of this work allows anyone to use it for any purpose including unrestricted redistribution, commercial use, and modification. | D: bell-shaped. |
Since eddy currents and magnetic damping occur only in conductors, recycling centers can use these to separate metals from other materials?
Here are the choices:
A. alloys
B. magnets
C. particles
D. cranes | Since eddy currents and magnetic damping occur only in conductors, recycling centers can use magnets to separate metals from other materials. Trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by magnetic damping while nonmetals in the trash move on, separat... | B: magnets. |
Most plates are made up of a combination of what?
Here are the choices:
A. continental and reflective lithosphere
B. continental and battered lithosphere
C. continental and oceanic lithosphere
D. oceanic and reflective lithosphere | If you look at the map pictured below, you will see that the lithosphere is divided into plates ( Figure below ). There are a dozen major and several minor plates. Each plate is named for the continent or ocean basin it contains. Some plates are made of all oceanic lithosphere. A few are all continental lithosphere. Bu... | C: continental and oceanic lithosphere. |
Chromosomes further condensed in which stage?
Here are the choices:
A. zooflagellate stage
B. zygum stage
C. diakinesis stage
D. tracheophyte stage | During the diakinesis stage, chromosomes further condense. The chiasmata remain intact during this stage. The remainder of this stage is similar to prometaphase of mitosis: the nucleoli disappear, the nuclear membrane disintegrates, and the meiotic spindle begins to form. | C: diakinesis stage. |
What weak base is applied as an agricultural fertilizer in its pure form and is diluted to make a household cleanser?
Here are the choices:
A. nitrogen
B. vinegar
C. carbon monoxide
D. ammonia | Figure 4.7 Ammonia is a weak base used in a variety of applications. (a) Pure ammonia is commonly applied as an agricultural fertilizer. (b) Dilute solutions of ammonia are effective household cleansers. (credit a: modification of work by National Resources Conservation Service; credit b: modification of work by pat001... | D: ammonia. |
During the winter, production of what amine involved in the sleep-wake cycle may be affected by less sunlight hours?
Here are the choices:
A. dopamine
B. serotonin
C. melatonin
D. folate | What does sunshine have to do with sleep (other than the sun shining in your eyes and waking you up)? For many people, sleeping problems have to do with an amine that the brain makes called melatonin. This compound affects the sleep-wake cycle and is affected by sunlight. During the winter, the daily cycle of melatonin... | C: melatonin. |
What is the term for the small particles that rocks are worn down to by water and wind?
Here are the choices:
A. pebbles
B. sediments
C. organisms
D. fragments | Weathering and erosion. Water, wind, ice, and even plants and animals all act to wear down rocks. Over time they can break larger rocks into smaller pieces called sediments. Moving water, wind, and glaciers then carry these pieces from one place to another. The sediments are eventually dropped, or deposited , somewhere... | B: sediments. |
Physical properties are characteristics that describe what as it exists?
Here are the choices:
A. matter
B. antimatter
C. life
D. imagination | Which of the following is matter and not matter? 1. the moon 2. an idea for a new invention Answer 1. The moon is matter. The invention itself may be matter, but the idea for it is not. To understand matter and how it changes, we need to be able to describe matter. There are two basic ways to describe matter: physical ... | A: matter. |
What allows for a large and mature fetus before birth, resulting from a long period of fetal growth in the uterus?
Here are the choices:
A. the ovaries
B. the vagina
C. the placenta
D. the cervix | The placenta permits a long period of fetal growth in the uterus. As a result, the fetus can become large and mature before birth. This increases its chances of surviving. | C: the placenta. |
What type of bonds form only between metals and nonmetals?
Here are the choices:
A. non-harmonic bonds
B. ionic bonds
C. magnetic bonds
D. harmonic bonds | Ionic bonds form only between metals and nonmetals. Metals "want" to give up electrons, and nonmetals "want" to gain electrons. Find sodium (Na) in Figure below . Sodium is an alkali metal in group 1. Like other group 1 elements, it has just one valence electron. If sodium loses that one electron, it will have a full o... | B: ionic bonds. |
A system is said to be in stable equilibrium if, when displaced from equilibrium, it experiences a net force or torque in a direction opposite to the direction of the what?
Here are the choices:
A. velocity
B. displacement
C. dispersement
D. variation | A system is said to be in stable equilibrium if, when displaced from equilibrium, it experiences a net force or torque in a direction opposite to the direction of the displacement. For example, a marble at the bottom of a bowl will experience a restoring force when displaced from its equilibrium position. This force mo... | B: displacement. |
What cycle completes the breakdown of glucose begun in glycolysis?
Here are the choices:
A. krebs
B. priebus
C. vireos
D. bacterium | The Krebs cycle completes the breakdown of glucose begun in glycolysis. If oxygen is present, pyruvate enters the mitochondria and is converted to AcetylCoA. AcetylCoA enters the cycle by combining with 4-carbon oxaloacetate. Study the diagram to confirm that each turn of the cycle (two for each glucose) stores energy ... | A: krebs. |
What do we call the full range of electromagnetic waves?
Here are the choices:
A. electromagnetic spectrum
B. molecular spectrum
C. electromagnetic scale
D. mechanical spectrum | Electromagnetic waves vary in their wavelengths, frequencies, and energy levels. The full range of electromagnetic waves makes up the electromagnetic spectrum. | A: electromagnetic spectrum. |
What kind of light ranges from red to violet?
Here are the choices:
A. infrared light
B. x rays
C. visible light
D. ultraviolet light | Visible Light The range of photon energies for visible light from red to violet is 1.63 to 3.26 eV, respectively (left for this chapter’s Problems and Exercises to verify). These energies are on the order of those between outer electron shells in atoms and molecules. This means that these photons can be absorbed by ato... | C: visible light. |
All matter in the universe is composed of one or more unique pure substances called what?
Here are the choices:
A. compounds
B. elements
C. molecules
D. atoms | The Levels of Organization To study the chemical level of organization, scientists consider the simplest building blocks of matter: subatomic particles, atoms and molecules. All matter in the universe is composed of one or more unique pure substances called elements, familiar examples of which are hydrogen, oxygen, car... | B: elements. |
What are the smallest type of blood vessels?
Here are the choices:
A. viens
B. neurons
C. capillaries
D. arteries | Capillaries are the smallest type of blood vessels. They connect very small arteries and veins. The exchange of gases and other substances between cells and the blood takes place across the extremely thin walls of capillaries. | C: capillaries. |
Athletes such as swimmers and bicyclists wear body suits in competition to minimize what forces?
Here are the choices:
A. natural forces
B. activity forces
C. rolling forces
D. drag forces | 5.2 Drag Forces 5. Athletes such as swimmers and bicyclists wear body suits in competition. Formulate a list of pros and cons of such suits. Two expressions were used for the drag force experienced by a moving object in a liquid. One depended upon the speed, while the other was proportional to the square of the speed. ... | D: drag forces. |
During strenuous exercise our muscles perform what kind of fermentation?
Here are the choices:
A. residual acid
B. nitric acid
C. lactic acid
D. excessive acid | Animals and some bacteria and fungi carry out lactic acid fermentation. Lactic acid is a waste product of this process. Our muscles perform lactic acid fermentation during strenuous exercise, since oxygen cannot be delivered to the muscles quickly enough. The buildup of lactic acid is believed to make your muscles sore... | C: lactic acid. |
What force causes waves to topple over and break on the shore?
Here are the choices:
A. tension
B. vibration
C. friction
D. momentum | Waves topple over and break on the shore because of friction with the bottom in shallow water. | C: friction. |
What type of simple machine is a seesaw an example of?
Here are the choices:
A. lever
B. single
C. steam
D. power | A: lever. | |
What part of a sample can be represented by the mean, median, and mode?
Here are the choices:
A. outer tendency
B. large tendency
C. central tendency
D. present tendency | The central tendency of a sample can be represented by the mean, median, or mode. | C: central tendency. |
Arteries have thinner wall layers and valves and move blood by the action of skeletal what?
Here are the choices:
A. muscle
B. collagen bands
C. marrow
D. hormones | During the systolic phase of the cardiac cycle, the heart is ________. contracting b. relaxing c. contracting and relaxing d. filling with blood 16. How do arteries differ from veins? a. Arteries have thicker wall layers to accommodate the changes in pressure from the heart. Arteries carry blood. Arteries have thinner ... | A: muscle. |
The fetal stage begins about how long after fertilization?
Here are the choices:
A. two months
B. three months
C. four months
D. one month | The fetal stage begins about two months after fertilization and continues until birth. During this stage, organs continue to develop, and the fetus grows in size. | A: two months. |
Which is the best way to maintain a strong, fit body?
Here are the choices:
A. being a vegetarian
B. a healthy diet
C. bodybuilding
D. regular exercising | Athletics are very competitive these days at all levels, from school sports to the pros. Everybody is looking for that edge that will make them faster, stronger, more physically fit. One approach taken by many athletes is the use of amino acid supplements. The theory is that the increase in amino acids in the diet will... | B: a healthy diet. |
Which system refers to the skin and its accessory structures?
Here are the choices:
A. digestive system
B. tomoxia system
C. malpighian system
D. integumentary system | What do you think when you look at your skin in the mirror? Do you think about covering it with makeup, adding a tattoo, or maybe a body piercing? Or do you think about the fact that the skin belongs to one of the body’s most essential and dynamic systems: the integumentary system? The integumentary system refers to th... | D: integumentary system. |
Normally, only traces of protein are found in urine, and when higher amounts are found, damage to what is the likely cause?
Here are the choices:
A. glomeruli
B. occidentalis
C. aeration
D. Hypothyroid | Urinalysis (urine analysis) often provides clues to renal disease. Normally, only traces of protein are found in urine, and when higher amounts are found, damage to the glomeruli is the likely basis. Unusually large quantities of urine may point to diseases like diabetes mellitus or hypothalamic tumors that cause diabe... | A: glomeruli. |
What is the nickname of the best-known geyser in the world, which erupts reliably every 90 minutes?
Here are the choices:
A. old faithful
B. old energetic
C. old consistent
D. victoria falls | Old Faithful ( Figure below ) is the best-known geyser in the world. The geyser erupts faithfully every 90 minutes, day after day. During each eruption, it may release as much as 30,000 liters of water!. | A: old faithful. |
The two general types of reproduction are sexual and what?
Here are the choices:
A. unisexual
B. primitive
C. bisexual
D. asexual | Reproduction is how organisms produce offspring. The ability to reproduce is a characteristic of all living things. In some species, all the offspring are genetically identical to the parent. In other species, each offspring is genetically unique. Look at the kittens in Figure below . They are brothers and sisters, but... | D: asexual. |
Acid rain is corrosive rain caused by rainwater falling to the ground through which gas?
Here are the choices:
A. sulfide dioxide
B. essential dioxide
C. sulfur dioxide
D. carbon dioxide | Sulfur enters the ocean in runoff from land, from atmospheric fallout, and from underwater geothermal vents. Some ecosystems rely on chemoautotrophs using sulfur as a biological energy source. This sulfur then supports marine ecosystems in the form of sulfates. Human activities have played a major role in altering the ... | C: sulfur dioxide. |
What is the net force when two forces act in the same direction?
Here are the choices:
A. sum of the forces
B. group of forces
C. arguing forces
D. number of the forces | Two forces may act on an object in the same direction. You can see an example of this in Figure below . After the man on the left lifts up the couch, he will push the couch to the right with a force of 25 newtons. At the same time, the man to the right is pulling the couch to the right with a force of 20 newtons. When ... | A: sum of the forces. |
What hypothesis states that the biosphere is its own living organism
Here are the choices:
A. small world theory
B. the seager hypothesis
C. the gaia hypothesis
D. Big Bang theory | The Gaia hypothesis states that the biosphere is its own living organism. | C: the gaia hypothesis. |
The planet neptune has strange dark spots that sometimes appear on its surface? what are these spots?
Here are the choices:
A. storms
B. seas
C. earthquakes
D. black holes | Neptune is very cold and has very strong winds. It had a large dark spot that disappeared. Another dark spot appeared on another part of the planet. These dark spots are storms in Neptune’s atmosphere. | A: storms. |
The thalamus acts as a gateway to and from what?
Here are the choices:
A. cortex
B. pons
C. spine
D. medulla oblongata | The thalamus acts as a gateway to and from the cortex. It receives sensory and motor inputs from the body and also receives feedback from the cortex. This feedback mechanism can modulate conscious awareness of sensory and motor inputs depending on the attention and arousal state of the animal. The thalamus helps regula... | A: cortex. |
When describing motion, what factor is just as important as distance?
Here are the choices:
A. pressure
B. velocity
C. direction
D. momentum | Direction is just as important as distance in describing motion. For example, if Mia told a friend how to reach the post office from her house, she couldn’t just say, "go 3 kilometers. " The friend might end up at the park instead of the post office. Mia would have to be more specific. She could say, "go west for 2 kil... | C: direction. |
What often relies on cooperation between the motor and autonomic nervous systems?
Here are the choices:
A. hypothalamus
B. ketosis
C. homeostasis
D. thermoregulation | C: homeostasis. | |
What nerves are connected to the spinal cord?
Here are the choices:
A. posterior nerves
B. primary nerves
C. superior nerves
D. spinal nerves | Spinal Nerves The nerves connected to the spinal cord are the spinal nerves. The arrangement of these nerves is much more regular than that of the cranial nerves. All of the spinal nerves are combined sensory and motor axons that separate into two nerve roots. The sensory axons enter the spinal cord as the dorsal nerve... | D: spinal nerves. |
What source of water pollution picks up chemicals from the ground with water and carries them to bodies of water?
Here are the choices:
A. sediment
B. fertilizer
C. runoff
D. erosion | Water pollution comes from many sources. One of the biggest sources is runoff. Runoff picks up chemicals such as fertilizer from agricultural fields, lawns, and golf courses. It carries the chemicals to bodies of water. The added nutrients from fertilizer often cause excessive growth of algae, creating algal blooms (se... | C: runoff. |
Where do all cells come from?
Here are the choices:
A. dying cells
B. busy cells
C. pre-existing cells
D. large cells | All cells come from pre-existing cells. | C: pre-existing cells. |
What is the term for learning from past experiences and reasoning?
Here are the choices:
A. logical learning
B. consequence learning
C. experimental learning
D. insight learning | Insight learning is learning from past experiences and reasoning. It generally involves coming up with new ways to solve problems. Insight learning generally happens quickly. An animal has a sudden flash of insight. Insight learning requires relatively great intelligence. Human beings use insight learning more than any... | D: insight learning. |
Science is the process of knowing about the natural universe through observation and this?
Here are the choices:
A. variation
B. Test
C. experiment
D. experimental | Chemistry is a branch of science. Although science itself is difficult to define exactly, the following definition can serve as starting point. Science is the process of knowing about the natural universe through observation and experiment. Science is not the only process of knowing (e. , the ancient Greeks simply sat ... | C: experiment. |
What type of plant keeps it green leaves year-round?
Here are the choices:
A. conifer
B. deciduous
C. evergreen plant
D. cactus | An evergreen plant keeps its green leaves year-round. It may have needle-like leaves to reduce water loss. | C: evergreen plant. |
What are reactions that can occur only in one direction called?
Here are the choices:
A. critical
B. irreversible
C. permanent
D. instantaneous | Some chemical reactions can occur in only one direction. These reactions are called irreversible reactions. The reactants can change to the products, but the products cannot change back to the reactants. These reactions are like making a cake. The ingredients of a cake—such as eggs and flour—are the reactants. They are... | B: irreversible. |
What is the diffusion of water molecules across a semipermeable membrane?
Here are the choices:
A. active transport
B. electrolysis
C. osmosis
D. organelle motion | Osmosis is the diffusion of water molecules across a semipermeable membrane and down a concentration gradient. They can move into or out of a cell, depending on the concentration of the solute. | C: osmosis. |
What forms when there is a difference in temperature between the land and the air?
Here are the choices:
A. smoke
B. fog
C. sandstorms
D. tsunamis | Fog forms when there is a difference in temperature between the land and the air. | B: fog. |
What domain-level category of cells can contain more than 1000 times the dna found in a typical bacterial cell?
Here are the choices:
A. eukaryotic
B. genetic
C. chromosomes
D. mutations | Figure 11.35 (a) Capillary action depends on the radius of a tube. The smaller the tube, the greater the height reached. The height is negligible for large-radius tubes. (b) A denser fluid in the same tube rises to a smaller height, all other factors being the same. | A: eukaryotic. |
What gas is released by burning of fossil fuels and contributes to global warming?
Here are the choices:
A. hydrogen
B. nitrous oxide
C. carbon dioxide
D. helium | Using fossil fuels affects the environment in a variety of ways. There are impacts to the environment when we extract these resources. Burning these fuels causes air pollution. These fuels release carbon dioxide, which is a major factor in global warming ( Figure below ). | C: carbon dioxide. |
A major disturbance in what results in an episode of severe weather called a storm?
Here are the choices:
A. the oceans
B. the core
C. the ozone layer
D. the atmosphere | A storm is an episode of severe weather. It is caused by a major disturbance in the atmosphere. Types of storms include thunderstorms, tornadoes, and hurricanes. | D: the atmosphere. |
Bone marrow, the thymus gland, the spleen, and the tonsils are organs in what body system?
Here are the choices:
A. reproductive system
B. skeletal system
C. nervous system
D. immune system | Immune system organs include bone marrow, the thymus gland, the spleen, and the tonsils. Each organ has a different job in the immune system. | D: immune system. |
What term refers to the balance, or equilibrium, within the cell or a body, and an organism’s ability to keep a constant internal environment?
Here are the choices:
A. homeostasis
B. metabolism
C. consciousness
D. ketosis | Homeostasis refers to the balance, or equilibrium, within the cell or a body. It is an organism’s ability to keep a constant internal environment. Keeping a stable internal environment requires constant adjustments as conditions change inside and outside the cell. The adjusting of systems within a cell is called homeos... | A: homeostasis. |
Atoms of different elements can combine in simple whole number ratios to form what?
Here are the choices:
A. carbon compounds
B. combinations
C. chemical compounds
D. mixtures | Atoms of different elements can combine in simple whole number ratios to form chemical compounds. | C: chemical compounds. |
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